The only recent changes to Ubuntu 18.04 I can see that might be relevant
are:
gnome-shell - 7 January 2019
linux (kernel) - A couple of times this month
There have been no changes to Xorg or mutter anyway...
** Package changed: xorg (Ubuntu) => linux (Ubuntu)
** Also affects: gnome-shell (Ubuntu)
Importance: Undecided
Status: New
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which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1813896
Title:
Monitors stopped working
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https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1813896/+subscriptions
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